Apparatus for drawing metal.



L. H. BRINKMAN.

APPARATUS FOR DRAWING METAL. APPLICATION FILED OCT. I5. 1914- 1,203,3 O6.- Patented 001. 31,1916.

' 4 suns-swan I.

WITNESSES 1km q m4;

L. H. BRINKM AN. APPARATUS FOR DRAWING METAL.

APPLICATION FILED OCT. I6. 1914.

1 1 m E L. E N N 3 m. M M .4. H v N U, 0 n m K.. A d m A 7 m 4 A r P A u N QM Q w A WITNESSES L. H. BRINKMAN.

APPARATUS FOR DRAWING METAL.

APPLICATION man ocr. I6. 1914.

1,203,306; Patented Oct. 31,1916.

4 SHEETS-SHEET 3- v i g 1 I Y 4 7 Arron/Er? L. H. BRINKMAN.

APPARATUS FOR DRAWING METAL.

APPLICATION FILED OCT. I6, 1914.

1,203,306. Patented Oct. 31,1916.

4 SHEETS-SHEET 4.

WITNESSES:

mvimoa W X .21., BY

ATTORNEYS {UNITED STATE-s rATENr o ion LOUIS H. arnum, or erimw nines, 'miw mnsnr, assrei'woa 'ro BALL ROLLED TUBE 'jconromrroma conroaa'rron or NEW Yong,

, APPARATUS FOR DRAWING METAL.

To all whom it may concern Be it known that I, Louis H. BRINKMAN,

a citizen of. the-UnitedStates, and a resident of Glen Ridge,county of Essex, State of New Jersey, have invented certain new and useful Improvements in Apparatus for Drawing Metal, of which the following is a specification. i

My invention relates to drawing metal. 7

One of the Objects of the invention is to apparatus for provide a'durable and eiiicient die for this purpose. A r

.The invention in its preferred embodiment is especially useful for drawing hot metal, and more particularly for drawing .jhot tubes, although it will be obvious to those skilled in the art, after understanding my invention, that certain of its-features are useful in drawing cold rods or tubes.

Another objectof the invention is to provide for cooling the die parts when drawing.

' hot metal, by using fluid forced through the eration. I a

v, is not desired, bot v v i simiply to reduce the thickness 'of'the metal.

die parts by or by the aid of centrifugal force, and .in the preferred embodiment of .'my invention using die balls, to cool the die balls by direct contact of the fluid and wash out the scale from the raceway in. such manner that'the fluid is conveyed off without Zooming in contact with the hot metal to chill it alid 1 thus interfere with the drawing op- Another' object. of the invention the provision ofrotary die apparatus ha'ving'a plurality of sets of ;die balls which, in the preferred embodiment of the invention, are so arranged that each set. may be separately adjusted radially to vary the diameter of the die thereat.

When the apparatus is constructed for drawing tubes, I may provide a. mandrel cooperating with the two sets of die balls, in i such manner that one set of balls acts to reduce the thickness of the metal while-the other set acts to'reduce the inner diameter of the tube, althou h where such operation! sets, of balls may acteludes, in some: respects, improvements on June 15, 1915,;.for improvementssin metal drawing machines,fgranted upon' an appli- Speciflcation, of Letters Patent.

avco

describe an apparatus r drawing hot' metal tubes embodying the present preferred Patented Oct. 31, 1916. "a l cation filed October 16,1914... Serial no. m,92s.'-

form of my invention, and I will thereafter particularly point out the features of my lnvention in-the appended claims.

In the accompanying drawings of said apparatus, Figure 1 is a side elevationof a, metal-drawing machine or apparatus em-' bodying the preferred form of my invention; Fig. 2 is a top plan view of the same? Fig. 3 is an enlarged elevation of a part of the machine showing the die apparatus properand other parts in section Fig. 4 is a further enlarged sectional view of the die mechanism proper; Fig. 5, isa fragmentary s'ect'ionalview taken on line 5-5 of Fig. 4; Fig. 6is a'fragmentary sectional view taken on line 66'of Fig. 4; Fig. 7 is a greatly enlarged longitudinal sectional view of a part of the device shown in Fig. 4; Fig. 8 is a cross-sectional view taken on line 8-8 of Fig. 3; and Fig. 9 shows a die mecha nism with aplurality of raceways.

Referring to the drawings, Figs. 1 and 2,;

1 is a platform or table on one end of which 1 is mounted a rotary motor 2-, onthe frame of which the ball die mechanism 3 is journaled, as hereinafter referred to. To the left of this mechanism I provide a furnace such as a gas-furnace 4, mounted on legs 5 and having a. series of gas pipes 6. This furnaceis hollow so as to permit the insertion of a mandrel 7 therethrough when tubes are be .ing drawn, andso as to receive the tube 8 to be heated and drawn.

Atthe rear of the motor a trackway 9 .block 11 are mounted on the trackway, an

offtongs 12 having their gripping jaws 1.3

extends along the table in alinement with y I the die. A draw head 10 and a following adapted to grip onto a plug or othersuitable' he subject'matter-ofapplication in-rm ans fll secured in the end of thetnbe 8 to be while the other extremity of toi drawhead 10, which is inturn pro with a. pivotal hook 16 having a hancation filed by me- 3111;? 24, .1912; an bymeans of which it is lifted into 2's ing in which suitable die ball-supporting as Z hollow spindle 29'.

v on the left-hand frame ofthe motor 2, the

and out of engagement with an endlem chain 18 passing over sprocket wheels '19 and 20 mounted near the opposite ends of the table. The chain is driven by means of a suitable motor 21' geared to the sprocket wheel 20 desired inner diameter of the finished tube.

' Referring to Figs. 35, a hollow spindle 29 is jou'rnaled in a rin 30 fitting in an annular recess of a projection 31 formed ring being provided with ball bearings 32.

Y A rotating supporting frame or die block 33 is threaded and keyed onto the extremityof the spindle and is provided with anopenparts, such as relatively adjustable die cheek plates 34 and 35, are secured, the check 7 plate 35 being preferably threaded into the die block 33,,the cheek plate 34 being keyed to saiddie block so 'as to slide in and out therein. The adjacent surfaces of the two cheek plates form'a raceway 37 for the die ballsv 38, and the balls are retained in this.

raceway by means of a retaining ring 39 .-(Figs.; 3 and .4 The check plates being I secured to the die block 33, rotate therewith,

' but the cheek late 34 is so keyed to the block that it may s ide longitudinally therein for the purpose of varying the diameter of the die, which is accomplished by the inclined surface 40' of the cheek plate 34 vforcing the balls inward or permittingthem to move outward, according as the cheek plate is moved toward or awayfrom the cheek plate 35. The adjustment of the cheek plate 34 is accomplished in the present form ofmy invention, by means'of-an adjusting device41 having an annular flanged portion 42 thread- I ed onto an annular frame 43 which is keyed to the projection 31 from the motor frame,

The adjusting device, which is in the form of a cap, has an end portion 44 surroundin the end of the die block 34 and is provid with an opening 45 in alinement with the The end portion 44 of the adjusting device is intended to thrust inwardlyagainst the cheek plate 34, and in order to avoid friction between said device and the .adjacent cheek plate 34in adjusting the die while the machine isin operation, and to, take up any -*thrustfrom the dieballs, I-

provide ball bearings 46 between the cheek plate 34 and the saidsurrounding portion 'and an adjacent the tube chine the ball die beadjulstod for the. succeeding draw wi 44 of the adjusting device; and I also provide ball bearings 47 between the inner end of thedie block 33 and the adjacent wall of the annular frame 43 for taking up the thrust of the die balls,,which will be exerted through the die block and said bearings against-the frame of the motor.

The adjusting device 41 is operated by a handle or pin (not shown), which is adapted to fit into holes 49 around the circumference of the flange 42 of the adjusting device by means of which the adjusting device may be screwed in and out along the annular threaded extension 43' of, the frame 43.

If it is desired to reduce the diameter of the die, the operator inserts the handle 48 in one of the sockets 49 on the adjusting cap 41, and rotates it in a direction to move it toward the motor, whereuponthe inward thrust of the cap .upon the cheek late 34 causes the same to be moved inw y, forcing its, tapering surface against the die'balls to move them inwardly, to reduce the diameter of the die. Conversely, if it is desired t0 enlarge the diameter, the operator rotates the ad ustable ca 41 in the op 'to direction, relieving the p to 34 of the xii-2 a,

so that when the tube is nlled .over the ting 'in an enlargement of the diameter of the die.

In the present form of myinvention, the annular flange 42 of .the adjusting device of the stations frame 43 are provi one with agradua scale 50 and the other with a pointer 51 whereby the adjusting device may be set proper limits r an desired diamatcr to vivahichhlthe tube or be drafzvn own.' t arrangemm timea or as been drawn the maut having to shut downthemaohine.

Inorder to efliciently, draw tabs 01' rods with a rotary ball die, it is important thatthe die should rotate-at a high speed,-and in order to accomplish this pin-pom and to simplify the machin the motor 2ismounted on the table in die and the rotor 52 of. the motor'is diconnected to the hollow spindle 29. e

twiththeball present form of my invention I use an electric motor to drive the hollow spindle,'and mount the of the motor 33 tile extension 29; :li'wmindle twopartso pm? vided with a 5a m together by bolts 54, altho .itwillbe that any suitable drive may be for rotatingthe parts.

' described is meneral somewhat similar to the apparatus orming the subject matter of my above-mentioned co-pending application, and in so far as it is similar it is covered by said application.

- I have found in practice that in the operation of ball dies for drawing metal, and particularly in the drawing of metaltubes, the surface of the finished tube is marked or slightly corrugated'by the action of the rootating die balls, and in order to overcome this difiiculty and render the product smooth, I provide the head 28 of the mandrel with a groove 56 lying substantially in the plane of the raceway, and preferably of a radius larger than the radius of the die balls operating in connection therewith, the forward edge of the groove being preferably slightly higher than the rear edge, The ob.- ject of providing this roove is to permit the die balls to crowd t e metal down into tube 57 preferably extending from the tail end of the mandrel and through the same of hard steel to to the enlarged head. I connect this tube up with a suitable source of cooling fluid 5.8, from which water will be discharged into the tube, from whence it will flow to the hollow headand out again through the hollow mandrel 7. This flow of water-will prevent the mandrel from becomin overheated by the furnace and the hot tu e. In

the preferred embodiment of the invention the enlarged head .of the mandrel is made revent wearing.

I have found 1n the operation of apparatus of this character for drawing hot metal,

that it is exceedingly important, if not ne'e essary, to cool the die parts, and in the case ofball die apparatus, to preferably bring the cooling fluid directly in contact with the die balls to more readily cool them. I have also found it extremely important, if not drawn. Such scale interferes with the die balls, and in the case of apparatus using die balls in a raceway, it clogs the raceway so as to seriously interfere with, if not prohibit, the proper operation of the apparatus; and one feature of my present invention contemplates the cooling of the die parts and the removal of the scale. It is important, if not necessar in doing this, to prevent the cooling flui from coming in contact with the hot metal being drawn, or

.is being drawn, I deliver fluid to the rotating, die parts in such manner that it is the die parts and out through passages 'arranged for its outlet. In the present embodiment of the invention the die cheek lates Y35 and 34 which form the raceway tween'them for the die balls, are so arranged as to provide an annular passage 60 (Figs; 4 and 7) leading therefrom and communicating with a series of openings or passages 61 leading to the inner surface of the rotary spindle 29. 7

The outer end of the cheek plate 34 is rovided with an annular flange 62 projectmg inward radially, so that the opening through said cheek plate is of less diameter than the inner diameter of the hollow spindle 29; and I provide means, such as a suit-- able pipe 63, having a flattened extension 64 projecting through the opening of cheek plate '34 and curved at its extremity so as to discharge the cooling fluid, preferably water, into the raceway, just within the annul'ar flange of said cheek plate. The object of this is to have the water so contained at the end of the die apparatus where delivered, that a slight head f will be maintained between'the delivery and discharge ends. When the fluid is to flow through the spindle it is thusdelivered into the rotating parts adjacent a portionofless radius from the center of the pass than the inner radius of the spindle, so as to provide this slight head to cause the water to flow from said pointof delivery, across the raceway and through the passagesror o enings 60, 61, into the hollow spindle an along course throu h thelspindle, since the action of the centrifugal force is ,so great that a large amount of water will be caused to flow through the parts with an extremely slight head between the'delivery point and the inner surface of the spindle. For example, I have found that'with the apparatus stationary, only an extremely small stream of water will trickle through the apparatus, While withv the apparatus running, a considerable amount of water will be caused to flow through the apparatus, due to the cencausedby centrifugal force to. flow against I trifugal force acting uponthe water deliv- The centrifugal force tends to throw the waered to therotating parts of said apparatus. Y

ter outward radially, so that in order to have it flow through the spindle rather than leak over the annular flange of the cheek plate 34, it is necessary that said flange 5 should be extended iflwardly nearer to the axis of the pass than is the inner surface of the spindle. While in drawing hot metal it is dedrable to convey the cooling fluid ofi through the spindle in this manner so as not to have it leaking over the apparatus .and'

getting in contact with the hot ing drawn, yet it will be ObVlOllS possibl metal to those skilled in the art, after understanding my invention, that the water may be otherwise led off through the die apparatus from the raceway.

While I have shown and described a machine in which die balls are used andin which the fluid is brought in direct contact with the balls to more readily cool them and to wash awayscale, obviously the cooling fluid may be caused to flow in other channels to cool the 'die parts. The passages 61 for fluid, above re erred to, .may be arranged in any suitable way, such as b drilling a series of holes through the chee plate 35, as shown. Inorder that the water may not be forced by the relatively great centrifugal force through the different parts of 1 the-die apparatus and come in contact with p the hot tube, I provide a packing rin 68 be,

tween'the die lock 33 and the chee plate 7 34, to prevent the flow of the cooling fluid between these two' parts; and I provide a 35 second packing ring 69 to prevent the flow of liquid between the die lock and cheek plate 35. f 4

. 'The operation of the machine described is,as follows: The mandrel 7 is lifted out 40 of the socket 26 and the tube 8 to be drawn is slipped over the rear end of the mandrel and into the furnace 4 where, after its forward end has been heated, the plug 14 is threaded or otherwise secured into the forward end of the tube and gripped by the tongs 12, which are then connected. to the draw head 10. The motor 2 driving the ball die is then started up, the cooling fluid ,turned on, the adjusting cap 41 movedto" 5 the desired setting, as indicated by the scale 50, and the handle 17 of the draw head is then operated to throw; the hook- 16 into engagement with one ofthe links of the endless chain 18, whereupon the tube '-is drawn as forwardthrough the ball die, the die-balls forcing the tube a inst to reduce the metal, .in the present form of the invention, as previously pointed out, beingforced by so the die balls into the groove 56 and stretched over the rear edge of the same in leaving the groove,-to obviate any ball marks-thereon. Afterthe' tube has been completely drawn through the die, the handle 17 will be it backto releasethe hook in the well put, it is important to be a \series of holes 95 dri the mandrel head ess of the 'metal, the

'known manner, whereupon the die is adjusted for the next draw and the operation repeated.

The form of the machine shown in Fig. 9 provides for the use of two separate sets of die balls 75, 76 which may be so arranged and constructed as to reduce the thickness of a tube by two ate 5 during one drawing operation without tering its inner diameter; but in the form of the invention shown, thetwo sets of die balls are used, the for ward set to reduce the thickness of the tube,

and the second set to reduce the inner diameter of the tube without reducing its thickness. In this form of the machine the an- 30' nular supporting frame 77, with the adjusting cap 78 and the thrust ball bearings 79, 80, thespindle 81 and the ball bearings 82, are all substantially as shown and described in the forego' form. But in order to use 35 the two sets d balls to advantage in the various uses to which the ap aratus may be I e to independently adjust the diameter of the die at each set of balls, and to do this it is necessary to independently adjust two of the die cheek plates. To this end, I provide the die block 83 with an intermediate stationary cheek plate 84, which may be ri' 'dly secured to the die block in any suitab e manner. On 05 each side of this check plate I provide longi- -tudinall shiftable cheek plates 85, 86. The check p ate 85 has anupwardly tapering surface 87 fqrmin with the ad acent surface of. the cheek p ate 84,a raceway for the set of die balls 75, and this raceway is ad justable to vary the diameter of the die at this set of balls, in the manner already vdescribed with reference to the first form of the invention. The-other cheek 'late 86 is 100 suitably threaded onto the end 0 the spin- I dle 81 by means of a lateral annular flange 88 which is internally threaded and which on its outer surface is provided with gear teeth 89 meshing with a pinion 90'set' on a stub shaft 91' mounted in the die block 83. v This pinion in turn meshes with an internal gear 92 cut on an annular flange projectin om an adjusting ring 93 loosely moun on the die block so asto be shifted thereon.

. This ring is provided with a series of holes Y 94 lying in the same lane with a second ll ed in the die block.

The outer stationary annular frame 77 is provided-with a slot 96 also in the plane of said holes, so that if it is desired to shift the'cheek late 86 to the left so as to-force the die ba s 76 down the inclined surface 97 y of cheek plate 84 to reduce the diameter of the die at this set of'balls, it is only neces-. 126 sary to insert a pin through slot 96 rnto one ofthe'holes94 and rotate the 93 in a direction which will cause cheek p ate 86' to rotate.through the intermediation of gear teeth 92, pimon 90 and gear teeth 89, in a 18 direction to screw it along the threads 98 toward cheek plate 84. To increase the diameter of' the die, the ring 93 is operated in the opposite direction. When the machine is operating the cheek plate 86 is held from longitudinal movement by extending. a

pin through one of the holes 94 of ring 93' into one of the holes 95 of the die block 83, so as to lock said cheek plate and die block from relative rotation by means of the connection through the aforementioned gear-" g. Where the device is'used as herein shown, to reduce the thickness of the metal by the action of the first set of die balls, and to reduce the inner diameter of the tube by the action of the second set of die balls without reducing its thickness at that point, I provide a mandrel preferably having an en larged head 99 and preferably having a groove 100, as and for the purpose heretofore described in connection with the first form of the machine, and also having a section 101 of reduced diameter forming a shoulder 102 just beneath the forward edge of the second'set of balls, over which shoulthe scale washed from the raceway in the same general manner as heretofore described, itbeing only necessary to provide passages 104-extending through the intermediate cheekplate 84 to connectthe raceways 105 and106, and to provide passages 107 from the last raceway to the inner surface of the hollow spindle Water or other.

= cooling fluid is delivered, as heretofore described, within the radially projecting lip or flange 108-of the cheek plate 85.

The operation of this form of the machine is in general similar to the operation of that heretofore described, except that the diameter of the dies at the second set of balls is adjusted by calculation or trial before the actual drawing of the commercial metal,

whereas, the forward set'of balls may be ad radial distance from the axis of the pass justed while the machine isrunning.

While I have described in detail an a paratus embodying the present preferred orm of my invention, it will be obvious to those skilled in the'art, after understanding this invention, that various modifications and changes may be made therein within the scope of the appended claims.

Havi'ngthus described my invention, what [I claim as new and desire to secure by Letters Patent, is

'1. In apparatus for drawing hot metal,

through said outlet 'assages.

the-combination of a rotary frame, a metaldrawing. die carried by said frame, means for rotating said frame, means for deliver- .ing a cooling fluid-to said die, and one or more passageways leading from the die through which the cooling fluid is forced by centrifugal force due to the rotation, whereby the fluid is revented from reaching the hot metal being operated upon by the die. j

2. In apparatus for drawin the combination of a rotary rame and a concentrically'ali'ned hollow tube connected to rotate therewith, means for rotating said frame and tube, a metal-drawing die mounted in said frame, one or more passageways leading from the die to the hollow tube to conve fluid from the die to the tube, and means ordeliveringv fluid to the die at a. point from whence it is forced by centrifugal force through the one or more passageways into the hollow tube and caused to flow along the inner surface of the same.

3. In apparatus for drawing hot metal, the combination ofafplurality of annular supporting plates, rotary die bodies supported thereby, means for. rotating saidplates, and means for delivering a cooling fluid to said rotary plates at a point from whence it will'be forced by centrifugal force to flow through said apparatus inengagement' with the supporting plates and be prevented from coming in contact with the hot metal being drawn;

1. In apparatus for drawing .metal,"the combination of rotary means including supporting plates for rotary die bodies, the adjacent' surfaces, of said lates forming an annular groove between th more fluid outlets therefrom, means for rotating said first means, rotary die bodies em having one or hot metal,

located in said groove, means for delivering fluid tov said groove where it is preventedby centrifugal force from reaching the hot metal being drawn and is forced through the one or more outlets 5. In apparatus for drawing metal tubes, f

the combination of die ball-supporting means having an annular raceway, die balls in said raceway, one or more fluid outlet passages from said raceway, means for de-. liveringfluid to the inner surface of the ball-supporting means at a point of-less than the radial distance of the bottom of the groove, from which point of delivery the fluid Wlll be caused by -centrifugal force to flow into the bottom of thexgroove and 6. In apparatus. or drawing metal, the

combination of a rotary member with a rotary spindle attached thereto, die ball-sup-f sages leading to the spindle, die balls in said raceway, and means for delivering liquid within said rotary member at a int from whence it will be caused by centri gal force to flow to the bottom of the raceway and through the outlet passage or passages to wash out the scale from the metal.

7. In apparatus for drawing metal, the combination of rotary means for supporting die balls, said means having an annular racewzg one or more outlet opem'ngs for m the raceway, die balls in said raceway, means for rotating said supporting means, and means deliver ng liquid to the raceway at a point of less radial distance from the axis of the pass than the radial distance from the bottom of the raceway, from whence the liquid will be caused by centrifugal force to be distributed within the raceway and flow from thence through the passage or passages to wash out the scale from the metal.

8. Inapparatus for drawing metal, the combination of a hollow rotary spindle, die ball-supporting means carried on said ,SPIH- dle and provided with a raceway having 85 raceway and through the said fluid outlet one or more fluid outlet assages therefrom leading to the inner surface of the hollow spindle, die balls in said raceway, and means for deliverin liquid to the raceway at a point the radlal distance of which from the axis of-the pass is less than the inner radius of the hollow spindle, whereby the liquid will be caused by centrifugal force to flow from its point of delivery into the 1 passage or passages to the inner surface of I the spindle and along the same.

apparatus for drawing metal, the combination of rotary means including die ball-supporting plates and a hollow tube connected to rotate therewith, means for rotatin said first'means, the adjacent surfaces 0 said plates-forming between them an annular raceway, oneor more'passages connectin the raceway and tube for conducting fluid rom the raceway .to the inner surface of the tube, die balls in said raceway, and

means for delivering fluid to the raceway at a point from, whence it is caused by cenrtrifugal force to flow around and partl fill the raceway and flow therefrom throug the one or more passages lon 'tudinall. of the apparatus and into the tu and' ong the inner surface of the same. v

.10. In apparatus for drawing hot metal tubes, the combination of a hollow rotatable spindle, a dieblock carried at one-end of t e indle and having an o ning therein" in almement with the spin e, die cheek plates mounted in. said opening and relatively adjustable axially o the spindle and having an opening therethrou h concentric with. the indle, a raceway or die balls formed, iniihe adjacent surfaces of the plates -face of the die for ,extendin the raceway and drel extendingthrough th and having an inclined wall, a series of die balls in said raceway, one or more passages leading from said raceway to the inner surthe raceway to said spindle, means for delivering fluid to the I cheek plate farthest a ay from the indle, at a point the radial distance of w from the axis of the pass is less than the inner radius of the spindle, from which delivery pointthe fluid will be caused by centrifugal force'to flow across the raceway and from thence through the p inner surface of the spin e to chilllinlgnof the hot metal tube by the fluid.

1. tubes the combination of a o ow rotary die block, die'cheek plates mounted in said die block and relatively adjustable axially thereof and ha an opening therethrou h, a raceway for die balls formed in the a jacent surfaces of the plates and having an inclined wall, a series of die balls in and having a groove formed therein lying substantially in the plane of the raceway, said groove being of radius of the die balls, whereby the metal of the tube will beicrowded into the groove by the rotating 'balls and again stretched as it leaves the exit side of the ve to prevent markings in the finish product due to the actionof the die balls.

12. In apparatus for draw hot metal tubes, the combination "of die bh ifisupporting means having an annular racewa die balls in said racewalvlameans at. themtake end tuag the tube,a mandrel into the no and inst which the tube 13 forced by the die be to draw it, one or more fluid outlet .p from said raceway, means for delivering fluid to the inner surface of the ball-supportin means at a point of lessradial distance em the axis of the pass than the radial distance of the bottom of'the racewnfi, from which point of delivery the fluid w becaused by centrifugal force to flow into the bottom of thro said outlet as- Sages to cool the die ba l i p 13. In apparatus for dra hot metal tubes, the combination of die -su?orting means having an annular raceway 1e balls in said raceway, means at'the intalze'end of the die for heating the tube, a' hollow manmeans said spindle for conveying fluid from er surface of the and along theprevent the apparatus for drawingl hot metal to the inner and into the die and against which the tubeis forced by the die balls to draw it, and means for conveying a cooling fluid into the mandrel to cool the same.

14. In apparatus for drawing hot metal tubes, the combination of die ball-supporting means having an annular raceway, die balls in said raceway, means at the intake end of the die for heating the tube, a mandrel extending into the die, said mandrel be ing provided with a groove lying substantially in theplane of the raceway and into which the metal is forced by the die balls in the drawing operation to prevent the balls from marking the finished tube, one or more fluid outlet passages leading from the die ball raceway, means for delivering fluid to the inner surface of the ball-supporting means at a point of less' radial distance from the axis of the pass 'than the radial distance of the bottom of the groove, from which point of delivery the fluid will be caused by centrifugal force to flow into the bottom of the groove and through saidout- -the combination of rotatable supporting parts for die balls, said supporting parts be ing provided with a plurality of annular raceways, a set of die balls in each raceway,

a mandrel extending within the die and against which the first set of balls forces the tube to reduce its thickness, said mandrel having a shoulder of reduced section substantially adjacent the second set of ballsf against which the balls force the tube to reduce its inner diameter, one or more passages for conveying fluid from one raceway to the other and .out therefrom, and means for delivering fluid to one of said raceways at a point from whence it will be caused by centrifugal force to flow .through said raceways and passages.

17. In apparatus for drawing metal, the combination of a rotary die block, means for rotating the same, a plurality of die cheek plates carried on said block and relatively adjustable axially of the pass, said plates forming between them two raceways for separate sets of die balls, die balls in said raceways, and means for individually adjusting two of said cheek plates axially to separately vary thediameter of the die at the two raceways.

18. In apparatus for drawing metal, the combination of a rotary die block, means for rotating the same, a plurality of die cheek plates carried on said block and relatively adjustable axially of the pass, said plates forming between them two raceways for separate sets of die balls, die balls in said raceways, means for individually adjusting twoof said cheek plates axially to separately vary the diameter of the die at the two raceways, one or more passages for conveying therefrom, and means for .delivering fluid to one of said raceways, at a point from whence it willbe caused by centrifugal force .plates forming between them two raceways for separate sets of die balls, die balls in said raceways, means for individually adjusting two of said check plates axially to separately vary the diameter of the die at the two raceways, and a mandrel extending into said die and against which the tube is forced during the drawing operation.

20. In apparatus for drawing metal tubes, the combination of a rotary die block, means for rotating the same, a cheek plates carried on sai block and relatively adjustable axially of the pass, said plates forming between them two raceways for separate sets of die balls, die balls in said raceways, means for individually adjusting two of said cheek plates axially to separately vary the diameter of the die at the two race ways, and a mandrel extending into thedie,

said mandrel having a portion against which the metal of the tube is pressed by lurality of die -fluid from one raceway to the other and out one set of die balls to reduce the thickness name to this specification, in the presence of twosubscribing witnesses.

LOUIS I-I. BRINKMAN.

Witnesses: S. MORTIMER WARD, J12, EDWIN SEGERJ 

